From that same Metafilter discussion:
“Adolescent female friendships are LEGENDARILY difficult and drama-prone. And they are! Being an adolescent girl and navigating the emotional landscape of female friendship is hella hard! It’s not just media hype to sell Mean Girls narratives! But I think the narrative the media wants to attach to it is “girls are so over-emotional and mean to each other” when actually I think the deeper narrative here is, “Girls make intense emotional demands on their friendships in ways that boys don’t, and girls have hyperdramatic adolescent friendship landscapes because they are learning to engage in reciprocal emotional relationships without an adult to mediate them.“ Adolescent girl friend drama is children learning to manage reciprocal emotional relationships like adults. Boys friendships are not, culturally, allowed to be so intense, dramatic, or emotionally-involving, so I think boys do not get the opportunity to learn and practice adult interpersonal relationships in the same way, and boys friendships simply do not place the same emotional demands on them. Girls MUST learn to function with emotional reciprocity in their friendships or get shut out of them; emotionality is so proscribed in male friendships that they simply never face that demand.
“So you have a lot of girls arriving in their late teens and early 20s with a decade of watching adult women manage other people’s emotions and considering it a skill to emulate, and then a decade of struggling through the whirlpools of adolescent female friendships and learning to do the work themselves. They’ve served their apprenticeships. They face demands of reciprocity from other women they’re friends with, and they’re accustomed to the idea that relationships involve giving as well as taking.
“Some boys, however, arrive in their late teens and early 20s without having ever had a peer make emotional demands on them, and without having ever had to function in a peer relationship where they have to both give and take. Their closest emotional relationships are with parents, and parent-to-child is give-give-give so the child is take-take-take. I think a lot of these young men, it has literally never occurred to them that someone they are emotionally close to would make any emotional demands on them, because that has literally never happened, because their early childhood years were full of nothing but women, and their adolescent years featured culturally-limited friendships that were emotionally superficial. So some of these guys? Yeah, they finish college and start dating seriously and they’re perfectly nice guys who have literally no idea how to function as emotional adults because they’re only just now starting to practice. They have the emotional literacy of 11-year-old girls. And, yeah, basically someone’s going to end up having to raise them from 11-year-old-ness in interpersonal relationships to adulthood, because it’s not really a task you can accomplish in the absence of other people with whom to be interpersonally related. …
“And Because Patriarchy we’re going to act like that’s just how 23-year-old men act and all roll our eyes instead of recognizing that, no, they’re actually behaving like 11-year-old girls, but it’s pretty embarrassing for them because it’s one thing when you’re 11 but when you’re 23 you really ought to know better. And at 11 you’re just making everyone around you miserable but at 23 you have the full power to ruin lives with your bullshit.
Full discussion in context.